51实验14.数码管从 000 显示到999

51实验14.数码管从 000 显示到999

#include "reg52.h"			
typedef unsigned int u16;	  
typedef unsigned char u8;

//138译码器管脚位定义
sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;

//数码表
u8 code smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
			         0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

//延时函数
void delay(u16 i)
{
	while(i--);	
}

void DigDisplay(u16 num)
{
	u8 i;
	u16 bits,ten,hundreds;
		//取位
	    bits=num%10;
	    ten=num/10%10;
	    hundreds=num/100;
		//前三个数码管亮
				LSA=1;LSB=1;LSC=1;
	            P0=smgduan[hundreds];
							delay(700);
				LSA=0;LSB=1;LSC=1; 
	            P0=smgduan[ten];
							delay(700);
				LSA=1;LSB=0;LSC=1; 
				P0=smgduan[bits];
							delay(700);
}
	
void main()
{	
	while(1)
	{	
		u16 n;
		//n从0到999循环
		for(n=0;n<1000;n++)
		{
				DigDisplay(n);  
		}
	}		
}